CN109655086B - Optical fiber displacement sensor with mechanical lever amplification - Google Patents
Optical fiber displacement sensor with mechanical lever amplification Download PDFInfo
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- CN109655086B CN109655086B CN201910050650.XA CN201910050650A CN109655086B CN 109655086 B CN109655086 B CN 109655086B CN 201910050650 A CN201910050650 A CN 201910050650A CN 109655086 B CN109655086 B CN 109655086B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 72
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 16
- 230000003321 amplification Effects 0.000 title claims abstract description 13
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 13
- 238000005452 bending Methods 0.000 claims abstract description 147
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 239000000835 fiber Substances 0.000 claims description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 230000003287 optical effect Effects 0.000 claims description 17
- 230000035945 sensitivity Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 1
- 239000007787 solid Substances 0.000 description 5
- 239000000428 dust Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000013308 plastic optical fiber Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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Abstract
The invention provides an optical fiber displacement sensor with mechanical lever amplification, which belongs to the technical field of optical fiber sensing, wherein a bottom shell, a surface shell, a long support and a short support form a fixed support part, a transmission rod, a first arc-shaped lever, a second arc-shaped lever, a first transverse support, a central transverse shaft and a second transverse support form a movable support part, a pull rod and a rocker form an auxiliary support part, an light inlet section, a first light inlet bending section, a second light inlet bending section, a third light inlet bending section, a light return section, a third light outlet bending section, a second light outlet bending section, a first light inlet bending section, a second light inlet bending section, a third light outlet bending section, a second light outlet bending section and a first light outlet bending section form a sensing optical fiber part.
Description
Technical Field
The invention relates to an optical fiber displacement sensor, in particular to a light intensity modulation type optical fiber displacement sensor with mechanical lever amplification, and belongs to the technical field of optical fiber sensing.
Background
The optical fiber displacement sensor has the characteristics of higher sensitivity, complex composition structure and high technical content, and can be well suitable for conversion of displacement signals, but most of the sensors have higher manufacturing cost and more severe use conditions, for example, when the optical fiber end face or grating gap of the sensor is corroded by moisture, dust, mildew and the like, the sensitivity and the accuracy of the sensor can be seriously affected.
Disclosure of Invention
The invention aims to provide the light intensity modulation type optical fiber displacement sensor with the mechanical lever amplification, which has higher sensitivity and can be stably used for a long time under complex environmental conditions.
The technical problems to be solved by the invention are realized by the following technical scheme: the sensor is composed of a bottom shell (1), a spring (2), a pull ring (3), a surface shell (4), a first light-in bending section (5), a first light-out bending section (6), a fiber fixing sleeve (7), a pull rod (8), a long support (9), a fiber fixing base (10), a transmission rod (11), a sleeve (12), a sensing piece (13), a light-in section (14), a light-out section (15), a light-in fiber joint (16), a light-out fiber joint (17), a light-in optical coupler (18), a light-out optical coupler (19), a short support (20), a rocker (21), a light-back section (22), a light-back section steel wire ring (23), a first transverse support (24), a first arc lever (25), a knife edge (26), a notch (27), a square hole (28), a central transverse shaft (29), a central steel wire ring (30), a third light-in bending section (31), a third light-out bending section (32), a second arc lever (33), a second transverse support (34), a second light-in bending section (35), a second light-out bending section (36) and a base (37).
The optical fiber sensor comprises a bottom shell (1), a face shell (4), a long support (9) and a short support (20), wherein the face shell, the long support (4), the short support (20) form a fixed support part, a transmission rod (11), a first arc-shaped lever (25), a second arc-shaped lever (33), a first transverse support (24), a central transverse shaft (29) and a second transverse support (34) form a movable support part, a pull rod (8) and a rocker (21) form an auxiliary support part, a light inlet section (14), a first light inlet bending section (5), a second light inlet bending section (35), a third light inlet bending section (31), a light return section (22), a third light outlet bending section (32), a second light outlet bending section (36), a first light outlet bending section (6) and a light outlet section (15) are respectively different sections on a continuous optical fiber, and the first light inlet bending section (5), the second light inlet bending section (35), the third light inlet bending section (31), the third light outlet bending section (32), the second light outlet bending section (36) and the first light outlet bending section (6) form a sensing optical fiber part.
The face shell (4) below and be equipped with vertically long support (9) and short support (20) in drain pan (1), long support (9) and short support (20) top all are connected with face shell (4) bottom surface, short support (20) below is equipped with rocker (21), rocker (21) top is connected with short support (20) bottom through third round pin axle (42), long support (9) and rocker (21) bottom all are equipped with square hole (28), be equipped with edge of a knife (26) in square hole (28), face shell (4) center is equipped with sleeve (12), wear to have transfer line (11) in sleeve (12), transfer line (11) top is equipped with sensing piece (13), sensing piece (13) bottom surface center is connected with transfer line (11) top, transfer line (11) bottom is equipped with central cross axle (29), central cross axle (29) are perpendicular with transfer line (11), central cross axle (29) both ends all are equipped with central wire ring (30).
A first arc-shaped lever (25) is arranged above a knife edge (26) at the bottom of the rocker (21), a first transverse bracket (24) is arranged at one end of the first arc-shaped lever (25) far away from a central transverse shaft (29), the first transverse bracket (24) is perpendicular to the first arc-shaped lever (25), return wire rings (23) are arranged at two ends of the first transverse bracket (24), a second arc-shaped lever (33) is arranged above the knife edge (26) at the bottom of the long bracket (9), a second transverse bracket (34) is arranged at one end of the second arc-shaped lever (33) far away from the central transverse shaft (29), a fiber fixing sleeve (7) is arranged at two ends of the second transverse bracket (34), the first arc-shaped lever (25) and one end of the second arc-shaped lever (33) close to the central transverse shaft (29) are connected with the central transverse shaft (29) through fourth pin shafts (43), notches (27) are arranged above the knife edge (26) and above the first arc-shaped lever (25) and the second arc-shaped lever (33), the notches (27) are closer to the first arc-shaped lever (25) than the first arc-shaped lever (29) by the pivot (33), the first arc lever (25) and the second arc lever (33) have lever amplification effect.
The face-piece shell (4) below is equipped with two solid fine seat (10), drain pan (1) one side is equipped with into optical coupler (18) and goes out optical coupler (19), drain pan (1) bottom one side is equipped with base (37), transfer line (11) middle part is equipped with horizontal pull rod (8), pull rod (8) one end is connected with transfer line (11) middle part through second round pin axle (41), pull rod (8) middle part is connected with long support (9) middle part through first round pin axle (40), the pull rod (8) other end is equipped with pull ring (3), be equipped with spring (2) between pull ring (3) and base (37), spring (2) top is connected with pull ring (3), spring (2) bottom is connected with base (37), the enclosing of long support (9), transfer line (11), pull rod (8) and second arc lever (33) closes the part and constitutes a mobilizable quadrangle structure.
Be equipped with in drain pan (1) a continuous optic fibre, it passes fiber fixing seat (10), fiber fixing cover (7), central steel wire ring (30) and return light section steel wire ring (23), the light path direction of advancing divide into light inlet section (14), first light inlet bending section (5), second light inlet bending section (35), third light inlet bending section (31), return light section (22), third light outlet bending section (32), second light outlet bending section (36), first light outlet bending section (6) and light outlet section (15) in proper order.
When external displacement acts on the sensing piece (13), the sensing piece (13) is driven by a driving rod (11), the second pin shaft (41), the fourth pin shaft (43), the central transverse shaft (29) and the central steel wire ring (30) move downwards, the pull rod (8) takes the first pin shaft (40) as a pivot to enable the pull ring (3) to tilt upwards, the spring (2) is lengthened, the first arc-shaped lever (25) and the second arc-shaped lever (33) respectively take the respective knife edge (26) as a pivot to enable the light return section steel wire ring (23) and the fiber fixing sleeve (7) to tilt upwards, the third light inlet bending section (31) and the third light outlet bending section (32) are pulled to be sharp under the action of the central steel wire ring (30), namely the curvature radius is reduced, the optical fiber loss of the third light inlet bending section (31) and the third light outlet bending section (32) is increased, meanwhile, the first light inlet bending section (5) and the first light outlet section (6) are fixedly sleeved (7), the second light inlet bending section (35) and the second light outlet bending section (36) are enabled to be bent upwards, namely the optical fiber loss of the second light inlet bending section (36) is increased, that is, a small change of the first arc lever (25) and the second arc lever (33) near one end of the central transverse axis (29) is changed into a large tilting of the first arc lever (25) and the second arc lever (33) far from one end of the central transverse axis (29), so that the curvature radius of each section of the sensing optical fiber part is further reduced, the optical fiber loss is further increased, and the sensitivity of the sensor is improved.
By adopting the technical scheme, the invention has the advantages and positive effects that: the optical fiber sensor is provided with a mechanical lever for amplification, has higher sensitivity, is not influenced by ambient temperature, humidity, cleanliness and electromagnetic interference, can not influence the performance of the sensor due to erosion of moisture, dust, mildew and the like, and can stably work for a long time.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, which are shown in the following 7 figures:
figure 1 is a front cross-sectional view of the present sensor,
Figure 2 is a state diagram of the present sensor in operation,
Figure 3 is an enlarged view of a portion of the present sensor before and after operation,
Figure 4 is a schematic view of the movable support portion of the present sensor,
Figure 5 is a perspective view of different segments on a continuous optical fiber,
Figure 6 is a schematic view of the direction of travel of the optical path,
Fig. 7 is a top cross-sectional view of the present sensor.
The numbers marked in the drawings are respectively as follows:
1. Bottom shell, 2, spring, 3, pull ring, 4, face shell, 5, first light inlet bending section, 6, first light outlet bending section, 7, fiber-fixing sleeve, 8, pull rod, 9, long bracket, 10, fiber-fixing seat, 11, transmission rod, 12, sleeve, 13, induction piece, 14, light inlet section, 15, light outlet section, 16, light inlet connector, 17, light outlet connector, 18, light inlet coupler, 19, light outlet coupler, 20, short bracket, 21, rocker, 22, light return section, 23, light return section steel wire ring, 24, first transverse bracket, the device comprises a first arc-shaped lever, a knife edge, a 27, a notch, a 28, a square hole, a 29, a central transverse shaft, a 30, a central steel wire ring, a 31, a third light inlet bending section, a 32, a third light outlet bending section, a 33, a second arc-shaped lever, a 34, a second transverse bracket, a 35, a second light inlet bending section, a 36, a second light outlet bending section, a 37, a base, a 38, side ears, a 39, screw holes, a 40, a first pin roll, a 41, a second pin roll, a 42, a third pin roll, a 43, a fourth pin roll, a 44, a shaking direction and a 45 light path advancing direction.
Detailed Description
According to fig. 1 to 7, the sensor is composed of a bottom shell (1), a spring (2), a pull ring (3), a surface shell (4), a first light-in bending section (5), a first light-out bending section (6), a fiber fixing sleeve (7), a pull rod (8), a long bracket (9), a fiber fixing seat (10), a transmission rod (11), a sleeve (12), a sensing piece (13), a light-in section (14), a light-out section (15), a light-in fiber-in connector (16), a light-out fiber-out connector (17), a light-in coupler (18), a light-out coupler (19), a short bracket (20), a rocker (21), a light-return section (22), a light-return section steel wire ring (23), a first transverse bracket (24), a first arc-shaped lever (25), a knife edge (26), a notch (27), a square hole (28), a central transverse shaft (29), a central steel wire ring (30), a third light-in bending section (31), a third light-out bending section (32), a second arc-shaped lever (33), a second transverse bracket (34), a second light-in bending section (35), a second light-out bending section (36) and a base (37).
The optical fiber sensor comprises a bottom shell (1), a face shell (4), a long support (9) and a short support (20), wherein the face shell, the long support (4), the short support (20) form a fixed support part, a transmission rod (11), a first arc-shaped lever (25), a second arc-shaped lever (33), a first transverse support (24), a central transverse shaft (29) and a second transverse support (34) form a movable support part, a pull rod (8) and a rocker (21) form an auxiliary support part, a light inlet section (14), a first light inlet bending section (5), a second light inlet bending section (35), a third light inlet bending section (31), a light return section (22), a third light outlet bending section (32), a second light outlet bending section (36), a first light outlet bending section (6) and a light outlet section (15) are respectively different sections on a continuous optical fiber, and the first light inlet bending section (5), the second light inlet bending section (35), the third light inlet bending section (31), the third light outlet bending section (32), the second light outlet bending section (36) and the first light outlet bending section (6) form a sensing optical fiber part.
The face shell (4) below and be equipped with vertically long support (9) and short support (20) in drain pan (1), long support (9) and short support (20) top all are connected with face shell (4) bottom surface, short support (20) below is equipped with rocker (21), rocker (21) top is connected with short support (20) bottom through third round pin axle (42), long support (9) and rocker (21) bottom all are equipped with square hole (28), be equipped with edge of a knife (26) in square hole (28), face shell (4) center is equipped with sleeve (12), wear to have transfer line (11) in sleeve (12), transfer line (11) top is equipped with sensing piece (13), sensing piece (13) bottom surface center is connected with transfer line (11) top, transfer line (11) bottom is equipped with central cross axle (29), central cross axle (29) are perpendicular with transfer line (11), central cross axle (29) both ends all are equipped with central wire ring (30).
A first arc-shaped lever (25) is arranged above a knife edge (26) at the bottom of the rocker (21), a first transverse bracket (24) is arranged at one end of the first arc-shaped lever (25) far away from a central transverse shaft (29), the first transverse bracket (24) is perpendicular to the first arc-shaped lever (25), return wire rings (23) are arranged at two ends of the first transverse bracket (24), a second arc-shaped lever (33) is arranged above the knife edge (26) at the bottom of the long bracket (9), a second transverse bracket (34) is arranged at one end of the second arc-shaped lever (33) far away from the central transverse shaft (29), a fiber fixing sleeve (7) is arranged at two ends of the second transverse bracket (34), the first arc-shaped lever (25) and one end of the second arc-shaped lever (33) close to the central transverse shaft (29) are connected with the central transverse shaft (29) through fourth pin shafts (43), notches (27) are arranged above the knife edge (26) and above the first arc-shaped lever (25) and the second arc-shaped lever (33), the notches (27) are closer to the first arc-shaped lever (25) than the first arc-shaped lever (29) by the pivot (33), the first arc lever (25) and the second arc lever (33) have lever amplification effect.
The face-piece shell (4) below is equipped with two solid fine seat (10), drain pan (1) one side is equipped with into optical coupler (18) and goes out optical coupler (19), drain pan (1) bottom one side is equipped with base (37), transfer line (11) middle part is equipped with horizontal pull rod (8), pull rod (8) one end is connected with transfer line (11) middle part through second round pin axle (41), pull rod (8) middle part is connected with long support (9) middle part through first round pin axle (40), the pull rod (8) other end is equipped with pull ring (3), be equipped with spring (2) between pull ring (3) and base (37), spring (2) top is connected with pull ring (3), spring (2) bottom is connected with base (37), the enclosing of long support (9), transfer line (11), pull rod (8) and second arc lever (33) closes the part and constitutes a mobilizable quadrangle structure.
Be equipped with in drain pan (1) a continuous optic fibre, it passes solid fine seat (10), gu fine cover (7), central steel wire ring (30) and return light section steel wire ring (23), continuous optic fibre both ends are equipped with into optical fiber receiving head (16) and play optical fiber receiving head (17) respectively, and advance optical fiber receiving head (16) and insert in optical coupler (18) one end, go out optical fiber receiving head (17) and insert in optical coupler (19) one end, gu fine seat (10) and advance optical fiber receiving head (16) and with go out optical fiber section between optical fiber section (17) and be optical fiber section (14) and optical fiber section (15) that go out, gu fine seat (10) are respectively first advance optical bending section (5) and first optical fiber bending section (6) to solid fine cover (10) and be close to optical fiber section between optical fiber cover (7) one side respectively, gu optical fiber section that optical fiber section between solid fine seat (10) and be second advance optical bending section (35) and second optical fiber section (36) and return light section (23) are optical fiber section (23) between optical fiber section (23) and return light section bending section (23).
The light path advancing direction is divided into a light inlet section (14), a first light inlet bending section (5), a second light inlet bending section (35), a third light inlet bending section (31), a light return section (22), a third light outlet bending section (32), a second light outlet bending section (36), a first light outlet bending section (6) and a light outlet section (15) in sequence, the shapes of the light inlet section (14), the light outlet section (15) and the light return section (22) in the light path are fixed, the generated light attenuation is a fixed value, the change amount of sensing is not influenced, the sensor generates light intensity modulation on the light signal in the optical fiber according to the principle of micro bending loss of the optical fiber, the total loss of the optical fiber is equal to the sum of micro bending losses of six micro bending sections of the first light inlet bending section (5), the second light inlet bending section (35), the third light outlet bending section (31), the third light outlet bending section (32), the second light outlet bending section (36) and the first light outlet section (6), and the light outlet section (15) are in a displacement proportional relation with the outside.
When external displacement acts on the sensing piece (13), the sensing piece (13) is driven by a driving rod (11), the second pin shaft (41), the fourth pin shaft (43), the central transverse shaft (29) and the central steel wire ring (30) move downwards, the pull rod (8) takes the first pin shaft (40) as a pivot to enable the pull ring (3) to tilt upwards, the spring (2) is lengthened, the first arc lever (25) and the second arc lever (33) respectively take the respective knife edge (26) as the pivot to enable the light return section steel wire ring (23) and the fiber fixing sleeve (7) to tilt upwards, the third light inlet bending section (31) and the third light outlet bending section (32) are pulled to be sharp under the action of the central steel wire ring (30), namely the optical fiber curvature radius at the position of the central steel wire ring (30) is reduced, the loss of the third light inlet bending section (31) and the third light outlet bending section (32) is increased, meanwhile, the first light inlet section (5) and the first light outlet bending section (6) are flattened by a fiber fixing sleeve (7), and the second light inlet bending section (35) and the second bending section (35) are enabled to be bent to be close to one side of the second light inlet section (35) and the second bending section (35) which is bent to form the second light inlet section (35) and the second bending section (35) The optical fiber loss of the second light inlet bending section (35) and the second light outlet bending section (36) is increased, the lever amplification effect is added, namely, small change of one end of the first arc-shaped lever (25) and one end of the second arc-shaped lever (33) close to the central transverse shaft (29) is changed into large tilting of one end of the first arc-shaped lever (25) and one end of the second arc-shaped lever (33) far away from the central transverse shaft (29), so that the curvature radius of each section of the sensing optical fiber part is further reduced, the optical fiber loss is further increased, and the sensitivity of the sensor is improved.
When the displacement is smaller, the curvature radiuses of the first light inlet bending section (5), the first light outlet bending section (6), the third light inlet bending section (31) and the third light outlet bending section (32) are larger, the bending of the second light inlet bending section (35) and the second light outlet bending section (36) is not obvious, and the total optical fiber loss of the optical fiber sensing section is smaller.
The larger the displacement is, the smaller the curvature radiuses of the first light inlet bending section (5), the first light outlet bending section (6), the third light inlet bending section (31) and the third light outlet bending section (32) are, the more obvious the second light inlet bending section (35) and the second light outlet bending section (36) are bent, the larger the total loss of the optical fibers of the optical fiber sensing section is, and after the external displacement is cancelled, the movable support part and the sensing optical fiber part are restored to the original state under the action of the spring (2).
The sensor needs to be additionally provided with a laser, a laser stabilized power supply, a focusing lens, a photosensitive device, a signal processing circuit and a data display, wherein the signal processing circuit at least comprises functions of pre-amplification, direct current balance, linear compensation and the like, a light source emitted by the laser is connected with an in-optical coupler (18) through an external optical fiber jumper and an optical fiber connector thereof, the light source is changed into an optical signal after being sensed by the sensor and is output by an out-optical coupler (19), the out-optical coupler (19) is connected with the focusing lens in front of the photosensitive device through the external optical fiber jumper and the optical fiber connector thereof, the optical signal is processed by the signal processing circuit after focusing of the focusing lens and photoelectric conversion of the photosensitive device, and the processed signal is displayed by the data display.
Because the optical fiber in the sensor is a continuous optical fiber, namely, the middle part of the optical fiber is not provided with an optical fiber joint or an optical fiber end surface, the sensing optical fiber part is not influenced by the environmental cleanliness, namely, moisture and dust in the air can not interfere the operation of the sensor, because the total loss of the optical fiber of the sensor is equal to the sum of microbending losses of six microbending sections of a first light-inlet bending section (5), a second light-inlet bending section (35), a third light-inlet bending section (31), a third light-outlet bending section (32), a second light-outlet bending section (36) and a first light-outlet bending section (6), and the mechanical lever amplification effect of a first arc lever (25) and a second arc lever (33) is added, the sensitivity of the sensor is higher, the optical fiber used by the sensor is 100 mu m/125 mu m multimode plastic optical fiber, the materials of a fiber fixing base (10) and a fixing sleeve (7) are soft rubber, and the types of a light-inlet fiber joint (16) and a light-outlet joint (17) are ST.
The side lugs (38) and the screw holes (39) are used for installing the sensor, the bottom shell (1), the face shell (4), the sensing piece (13), the first arc-shaped lever (25), the second arc-shaped lever (33), the fixed support portion and the movable support portion are all made of aluminum alloy, the cross sections of the long support (9), the short support (20), the transmission rod (11) and the rocker (21) are rectangular, and when the transmission rod (11) moves downwards, the bottom of the rocker (21) slightly deviates to one side of the transmission rod (11) under the traction of the first arc-shaped lever (25).
Claims (1)
1. An optical fiber displacement sensor with mechanical lever amplification comprises a bottom shell (1), a spring (2), a pull ring (3), a surface shell (4), a first light-in bending section (5), a first light-out bending section (6), a fiber fixing sleeve (7), a pull rod (8), a long bracket (9), a fiber fixing seat (10), a transmission rod (11), a sleeve (12), a sensing piece (13), a light-in section (14), a light-out section (15), a light-in fiber joint (16), a light-out fiber joint (17), a light-in coupler (18), a light-out coupler (19), a short bracket (20), a rocker (21), a light-return section (22), a light-return section steel wire ring (23), a first transverse bracket (24), a first arc-shaped lever (25), a knife edge (26), a notch (27), a square hole (28), a central transverse shaft (29), a central steel wire ring (30), a third light-in bending section (31), a third light-out bending section (32), a second arc-shaped lever (33), a second transverse bracket (34), a second light-in bending section (35), a second light-in bending section (36) and a base (37);
The optical sensing device comprises a bottom shell (1), a face shell (4), a long support (9) and a short support (20) which form a fixed support part, a transmission rod (11), a first arc-shaped lever (25), a second arc-shaped lever (33), a first transverse support (24), a central transverse shaft (29) and a second transverse support (34) which form a movable support part, a pull rod (8) and a rocker (21) form an auxiliary support part, a light inlet section (14), a first light inlet bending section (5), a second light inlet bending section (35), a third light inlet bending section (31), a light return section (22), a third light outlet bending section (32), a second light outlet bending section (36), a first light outlet bending section (6) and a light outlet bending section (15) which are respectively different sections on a continuous optical fiber, and the first light inlet bending section (5), the second light inlet bending section (35), the third light inlet bending section (31), the third light outlet bending section (32), the second light outlet bending section (36) and the first light outlet bending section (6) form a sensing optical fiber part;
The method is characterized in that: a vertical long support (9) and a vertical short support (20) are arranged below the face shell (4) and in the bottom shell (1), the top ends of the long support (9) and the short support (20) are connected with the bottom surface of the face shell (4), a rocker (21) is arranged below the short support (20), the top of the rocker (21) is connected with the bottom of the short support (20) through a third pin roll (42), square holes (28) are formed in the bottoms of the long support (9) and the rocker (21), a knife edge (26) is arranged in the square holes (28), a sleeve (12) is arranged at the center of the face shell (4), a transmission rod (11) penetrates through the sleeve (12), an induction piece (13) is arranged at the top of the transmission rod (11), the center of the bottom surface of the induction piece (13) is connected with the top end of the transmission rod (11), a center cross shaft (29) is arranged at the bottom of the transmission rod (11), the center cross shaft (29) is perpendicular to the transmission rod (11), and center steel wire rings (30) are arranged at two ends of the center cross shaft (29).
A first arc-shaped lever (25) is arranged above a knife edge (26) at the bottom of the rocker (21), a first transverse bracket (24) is arranged at one end of the first arc-shaped lever (25) far away from a central transverse shaft (29), the first transverse bracket (24) is perpendicular to the first arc-shaped lever (25), return wire rings (23) are arranged at two ends of the first transverse bracket (24), a second arc-shaped lever (33) is arranged above the knife edge (26) at the bottom of the long bracket (9), a second transverse bracket (34) is arranged at one end of the second arc-shaped lever (33) far away from the central transverse shaft (29), a fiber fixing sleeve (7) is arranged at two ends of the second transverse bracket (34), the first arc-shaped lever (25) and one end of the second arc-shaped lever (33) close to the central transverse shaft (29) are connected with the central transverse shaft (29) through fourth pin shafts (43), notches (27) are arranged above the knife edge (26) and above the first arc-shaped lever (25) and the second arc-shaped lever (33), the notches (27) are closer to the first arc-shaped lever (25) than the first arc-shaped lever (29) by the pivot (33), the first arc lever (25) and the second arc lever (33) have lever amplification effect;
Two fiber fixing bases (10) are arranged below the face shell (4), an optical inlet coupler (18) and an optical outlet coupler (19) are arranged on one side of the bottom shell (1), a base (37) is arranged on one side of the bottom shell (1), a transverse pull rod (8) is arranged in the middle of the transmission rod (11), one end of the pull rod (8) is connected with the middle of the transmission rod (11) through a second pin shaft (41), the middle of the pull rod (8) is connected with the middle of the long support (9) through a first pin shaft (40), a pull ring (3) is arranged at the other end of the pull rod (8), a spring (2) is arranged between the pull ring (3) and the base (37), the top end of the spring (2) is connected with the pull ring (3), and the bottom end of the spring (2) is connected with the base (37), and the enclosing parts of the long support (9), the transmission rod (11), the pull rod (8) and the second arc-shaped lever (33) form a movable quadrilateral structure.
The bottom shell (1) is internally provided with the continuous optical fiber which passes through the fiber fixing seat (10), the fiber fixing sleeve (7), the central steel wire ring (30) and the light return section steel wire ring (23), and the advancing direction of the optical path is sequentially divided into a light inlet section (14), a first light inlet bending section (5), a second light inlet bending section (35), a third light inlet bending section (31), a light return section (22), a third light outlet bending section (32), a second light outlet bending section (36), a first light outlet bending section (6) and a light outlet section (15);
When external displacement acts on the sensing piece (13), the sensing piece (13) is driven by a driving rod (11), the second pin shaft (41), the fourth pin shaft (43), the central transverse shaft (29) and the central steel wire ring (30) move downwards, the pull rod (8) takes the first pin shaft (40) as a pivot to enable the pull ring (3) to tilt upwards, the spring (2) is lengthened, the first arc-shaped lever (25) and the second arc-shaped lever (33) respectively take the respective knife edge (26) as a pivot to enable the light return section steel wire ring (23) and the fiber fixing sleeve (7) to tilt upwards, the third light inlet bending section (31) and the third light outlet bending section (32) are pulled to be sharp under the action of the central steel wire ring (30), namely the curvature radius is reduced, the optical fiber loss of the third light inlet bending section (31) and the third light outlet bending section (32) is increased, meanwhile, the first light inlet bending section (5) and the first light outlet section (6) are fixedly sleeved (7), the second light inlet bending section (35) and the second light outlet bending section (36) are enabled to be bent upwards, namely the optical fiber loss of the second light inlet bending section (36) is increased, that is, a small change of the first arc lever (25) and the second arc lever (33) near one end of the central transverse axis (29) is changed into a large tilting of the first arc lever (25) and the second arc lever (33) far from one end of the central transverse axis (29), so that the curvature radius of each section of the sensing optical fiber part is further reduced, the optical fiber loss is further increased, and the sensitivity of the sensor is improved.
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